Service and troubleshooting
8.62 EST3 Installation and Service Manual
Table 8-38: Signature module trouble messages
Trouble message Possible cause Possible solution
Relay switched Relay toggled from actual
state
Manually reset relay
Replace Module
Data circuit ground fault See Table 8-32 See Table 8-32
Vector Current Too Large Devices on the Signature
data circuit are drawing too
much current during the
mapping procedure.
Short or low resistance shunt on
Signature data circuit
Vector Current Too Small Devices on the Signature
data circuit are not drawing
enough current during the
mapping procedure.
Excessive circuit resistance
Defective base
Defective wiring
EEPROM Not Initialized EEPROM not properly
programmed
Replace module
EEPROM Write Time-out Bad EEPROM Replace module
A/D Time-out Defective A/D converter Replace module
EEPROM Write Verify Fault Defective EEPROM Replace module
Line Monitor Trouble Signature data circuit voltage
low
Check Signature data circuit
Class A Trouble Open or shorted input or
output circuit
Check input / output circuit wiring
3rd Wire Trouble Voltage is out of range on the
wire that supplies 24 Vdc
power to SIGA-UM.
Check power supply output
Check wiring
3rd Wire Trouble Voltage on the wire supplying
24 Vdc smoke power to
SIGA-UM is out of range.
Check power supply output.
Check wiring
RAM Not Programmed Bad RAM Replace Module
Displaying trouble tables
The Trouble Tables display eight categories of active device
trouble. Each list displays the short address or serial number of
the devices experiencing that trouble condition. The total number
of devices in each list is indicated at the bottom of the list.
The active troubles displayed in the Trouble Tables should be
compared with a device’s trouble history displayed in the
Display Device Trouble lists, to determine any possible trouble
pattern.
Note: You must be actively
connected to the network
via download cable to
display the trouble tables.
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